Vehicle tire



oa. 2o, 1925. 1.557.912

l cK

EEEEEEEEE RE Patented Oct. 20, 1925.

. UNITED STA-TES 1,557,972 PATENT OFFICE.

ROLLA B. BOSTWICIK, 0F DUQUESNE, PENNSYLVANIA.

VEHICLE TIRE.

Application filed August 13, 1923. Serial No. 657,224.

ATo ali/whom t may concer/n.:

Be it known that I, HOLLA B. Bos'rwloir, a citizen of the United States, and resident of Duquesne, in the'county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in VehicleTires;

matic tires, and which shall be so constructed as to have great resiliency, thereby producing the easyriding effects of apneumatic tire without the inconveniences due to punctures and blow-outs. y

In Letters Patent No. 1,367,011 granted to me February 1, 1921, and No. 1,367,856 granted to me February 28, 1921, I have shown non-pneumatic vehicle tires in which the core of the tire is composed of an outer member of rubber arranged adjacent to the tread of the casing, and supported by a hollow metal member which is made wedgeshaped in cross section and is provided with a vrounded' inner nose portion which bears against'the free edges of the Vcasing and tends to force the beads of the casing against the flanges of the rim. f

The tires constructed withA the hollow metal core supports which are shown in the priorpatents mentioned are entirely satisfactory for many purposes, but I have discovered that greater resiliency is obtained by employing, instead of a metal core support, a rubber member of somewhat similar shape, the rubber composing theinner or supporting part of the core being softer than the outer portion which is adjacent to the tread of the casing. I have also found that thisconstruction, wherein the inner part of the core is softer than the outer part, affords Vgreater resiliency thanjis obtained by a core having a soft rubber tread portion supported by a harder rubber inner portion.

In the accompanying drawing, Fig. 1 is a transverse sectional' view taken through a tire constructed in accordance with my invention, the section being taken substantially on the line 1 1, Fig. 8; Fig. 2 is another sectional view, similar to Fig. 1, showing the position of the anchoring wedge, the section being taken substantially on the line 2-2, Fig. 3; Fig. 3 is a longitudinal radial-section through a portion of the tire N shown in Figs. 1 and 2; Fig. 4 is a pers'pective view of the anchoring member, and Fig. 5 is ay transverse sectional view showing a core of modified construction.

In the drawing the numeral 2 indicates'ia y, casing or shoe which maybe of any desired type such vas is used in pneumatic tires .for automobiles. A clinclier tire is shown'herein, but the tire may equally well be ofthe straight-side type. The casing 2 hasfbeadsH 3 which, when the tire is in use, ,areprel lceived Vwithin the flange portion 1 of a rim 5 Awhich is carried by the usual fellyi.

lAdjacent to the beads `3. the casing has `'flat tapering inner surfaces?.

Vwithin the Casing 12, but formed @parma therefrom, is a corelconsisting ofan outer or tread section 8, and an inner or supporting'section 9. Both of the members 8 and 9 are made of rubber, rubber substitute, or Y other resilient and elastic material. The member 9 is preferably madeof softer material than the member 8, and thisis best ldone by making the members 8 and 9 sepa- "rately and fitting them together in the manner shownin'the drawin'gf However, it is within the' scope of my invention .to make the members 8 and 9 inte'g'raljwith`r each other, if desired.

` The members 8 and 9 arelso interfitted to prevent these parts from being separated Vby twisting or bending movements. ,4 To this end, the member'8 is provided with a longitudinal recess 10 inthe centerv of which is l formed a smaller recess '11.' v"Ih'eoute'r portion of the supportin'gmember 9 fits within the large recess 10 and is provided withV a projecting central rib 12that is received in the recess 11 of theouter member 8. As

shown in Figs.r 1 and 2 of the drawing, the l, upper side edges 13 of the inner member/9 form right angles with the outer surface 14 of this member, andthe large recess 10 in the outer member 8 is correspondingly formed withv right-angled corners. "There may be, however, some variation from this precise construction, provided that the members 8 and 9 are. made to in'tert with each otherl so as to resist separation by'twisting and bending movements.

The sides of the member 9 may be lightened by forming grooves in them as shown at 15. The inner or nose portion 16 of the member 9 is rounded to engage the tapering surface 7 of the casing with a shaped that aspace "17 fveXi'sts betweeil'i thev wedgingj-action[which tends to '.force'tlie beads of the casing into the flanged recesses of the rim. The parts are preferabl'yso rounded nose portion 16- of the member@ and the surface of the rim 5 so that the member 9 may have acertain amountof radial play and mayl tli'erea-fte'r'exert its yvedging action upon the beads of the casing. In the rimv 5,and alsohto insure that none Vof the parts Willl creep upontherrim lor with lrelation toi-each otliergl employ al Wedge shaped anchoring member' 20 which, fas Vbest shovvn in'Fig. 4, isprovided on its sides With teethv '21,; or other projections, vvlii'ch bite into the tapered inner walls 7 Uofthe casing and tendV to clamp thebeads'fof the casing dovviifvvardly and youtwardly f against therim. This clamping action is produced k.by-)means of fa bolt 22 is screwed vinto a central threaded"opening QB inthe member "20' and which `m`ay 'extend through a Washer 24: and through Athe 1valve-'stem hole which Kis 'ordinarily "provided in the =felly 6. V'By yti'irn'iiig'fthe'liead'25fof the bolt' 22, the member '20f`ma'y"be forced to eompre'ss the adjacent portions ofthe casing "tightly upon Vthe rim. V

The aiichoringfineinber'QO' is received in a recess`26 4Which is formediin the 'inner Core Y memberv ,91aid' thus yresistslengthwise creeping movement fthel efre'w'ith respect to the casing.l 'It vvill be4 observed that the sides of' theanchorigfmember'QO are 'of *substantially the'fsa'me rounded' shape as ithe 'inner'prtioiis' of core `member 9v so that j n -l thereof.

` the member 2O may be assembled :With the cofre and lplaced upon the' rim AWithout difs ficulty. Y

. The coreme'mbe'rs 8and9 may' each be made info'ne yor'fr'iiore .sections- For vconvenienee,` I, prefer 'to make each! of these members with jtvvo -oif'threefsections, of proper length tokiill 'the' cavity ofthe c'asiiig'f when the sectioi'i's'are 'assembled in "the casing The'eonstruction shown' in Fig, 5 'dier's f v K or equivalent elastic material than 'said outer from'v that; of the fprecedingffigures in that f the inner or su'pportlin'gpart9-a of the'core is madejivith 'straight tapering sidesfQ i below `which isanV enlarged'nose portion 28 which 'engages the inner'surfaces of the/easing Q -vvith the vsame. eect as the lnofse portion of the member 9 of Figs.` l'to 3. `As shown,

Vthev edges. of the member Sanmay'bebrought ordertoseeure the assembled tire upon fdovvn to enclose the upper surfacesg of the ymember 9a as shown infFigsjl landQ.

It Will be noted that the casing of the tire is Inot modified 'infany Way, and also that the core construction is not made integral With the casing. V'llie-refore, when acasing is Worn through it is only necessaryto'remove the core members and place these members in a new casing, a .single core structure lbeing therefore'suitable for use with `iia'ny different casings.

`Tires constructed in`tlie`mannez."v described I have s hovvn ai'i'd'fdescifibed' the manner in' Which I prefer to construct" my 'impro ved tire'sbut' it Will be understood that =various changes 'may be ymade "vvi'tliin'the "scope `V`of my invention yas set forth in 'the' appended claims. Y

I' claim 4as my invention: o, v l l 1. In a vehicle tir.e,"the combination of es 'i a casing adapted 'toseat unon 'n."Wlieel'riiii, y

a resilient core' co'ntainedv'zithin lsaid casing, vsaid core 'comprising an Vouterportion of 'substantially semi-circular Icross sectionand composedof rubber or a-n'eq'uiw 'alent Velastic materiah 4'and' an'iimerLS'ub- Y stantially annular portionl ofsofter'rubber" normally spaced fro'mthe VWheel riingfsaid in- .ner core'portionjhaving itsj'in'ner "surface l`4rounded to form"`a Wed'ging-'noseengagiiig said casingadjacent to the "free'ledg'es Y,

`2. VIn a vehicle tire,` the'fcombi'natino-f-a casing and a resilientcore-'contained Within *said casing, saidA core having fan out'eror tread portion f'of substantially semicirc'ular cross v'sectionf and'composedof'an `elastic m a- 'teriah 'said'oifiter lcore member h'aviiiga longitudinal recess' and la vnarrower-'longitudinal recess vvithiiisaid vfirst-namedv recess,

andiaii: inner core portion ofso'fter rubber 1 coreE portion,- vsaid innerV core''portion"being fitted Within the recesses' of said 'outer core portion and having its inner edge I; the saidrRoL'LAiB.

VBos'iwioig have hereunto set Imy Lhand. 

